Window treatment accessory



FIG. 1 is an enviromental perspective view of the claimed window treatment accessory;

FIG. 2 is a top plan view thereof (the bottom plan view and left and right side views being indentical to the top plan view);

FIG. 3 is a front view thereof; and,

FIG. 4 is a rear view thereof.

The broken line showing of a cut-away portion of a partial curtain, rod and bracket in FIG. 1 and a mounting screw in FIGS. 1, 2 and 4 are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a window treatment accessory, as shown and described. 